Implementation thougt: I think you can Enable the menu item if
"SalEditCanPaste() and not SalSendMsg( PAM_CannotEditTblCol, hWndTblCol, 0,
0)". On the table column Return True if the table cell is not editable.
Instead of hWndTblCol maybe it would be better to use hWndTbl and better
hWndItem/hWndForm to generalize this.